I've used HSM stuff in several different chamberings, including some fairly hot .444 & 45-70 and also some .375 Win. They used to be the company that loaded the fine Speer Grand Slam bullets, which I bought in several different chanberings, but now that's BVAC ammo. A lot of theirs is now sold at Cheaper than Dirt including some hot 45-70s.

__________________
A veteran is someone who, at one point in his life, wrote
a blank check made payable to The United States of
America for an amount of up to and including my life.
That is honor, and there are way too many people in this
country who no longer understand it.

I've used HSM match ammo in a pinch (had no handloads for an unplanned need) and have had no complaints. Champion's Choice had it at Camp Perry and still sell it through their catalog. They told me their customers had all been positive about it. They don't carry the loads the OP is interested in— just target ammunition—but the fact someone catering to competitive target shooters finds HSM's quality up to that task is a good sign.

"First contemplation of the problems of Interior Ballistics gives the impression that they should yield rather easily to relatively simple methods of analysis. Further study shows the subject to be of almost unbelievable complexity." Homer Powley

"First contemplation of the problems of Interior Ballistics gives the impression that they should yield rather easily to relatively simple methods of analysis. Further study shows the subject to be of almost unbelievable complexity." Homer Powley

Finally got some HSM Bear Loads in .45 Colt. The Chrono shows 1030 fps avg from my 5.5" BlackHawk. My ballistics program in my iPhone says that will only drop to 912 fps at 100 yds, where it will be 9 inches low.
At 200 yds I am at 826 fps ( about the same as a .45 ACP but with a 325 gr bullet !) and 58 inches low!

These are pretty acceptable numbers for me.

Casey in Alaska

PS: Did you all see the bear killed in self defense in Portage Alaska from the guys duck blind??